First off, you're just one of a LOT of people. For example, the US is the 3rd most-populous country in the world, but it would have to gain more than a BILLION people to become #1.
According to the CIA, the population of the US in 2017 is a little over 325 billion people. That's over 950 million fewer than India (about 1.282 billion) and over 1.05 billion fewer than China (about 1.379 billion)
In fact, Southeast Asia is so populous that there are more people living inside this circle than outside of it.
And if you count anyone that's ever lived, our history is vast. Humans have been around for about 200,000 years, but our written history only goes back about 5,000–6,000 years.
And how about our planet? The Mariana Trench is 10,994 meters deep...that's a larger distance than the usual cruising altitude of a commercial airliner, which is 10,668 meters.
So the Earth is a pretty big place...but so is the space around it. Here's the distance from the Earth to the moon, to scale.
Even though the moon is really frickin' far away (384,400 km on average), you can fit every planet in the solar system between the Earth and the moon.
The added diameters of Mercury (4879 km), Venus (12,104 km), Mars (6771 km), Jupiter (138,350 km), Saturn (114,630 km), Uranus (50,532 km), and Neptune (49,105 km) are just a little over 380,000 km.
That's especially crazy when you consider that North America would look kinda like this if it was on Jupiter:
Earth is really kinda tiny, in the grand scheme of things. This is what the Earth looks like from Mars:
And this is what it looks like from just beyond Neptune:
In fact, planets in general ain't shit. The sun makes up 99.8% of the mass in our solar system.
But GUESS WHAT: THE SUN IS TINY TOO! Here it is, to scale, against hypergiant star VY Canis Majoris:
And our galaxy, the Milky Way, is so big that when you look up into the night sky, you only see the stars that are within this little yellow circle:
So, wow! The Milky Way is big! But it's nothing compared to some of the biggest galaxies we've observed, like IC 1011.
You can just keep zooming out until you go insane from the unimaginable immensity of it all.
And that's just the OBSERVABLE universe, aka "whatever we can see from Earth at the moment." So it could be bigger. Or we could be one of many universes in a multiverse.